Classifications

• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
  • H03K17/945—Proximity switches
  • H03K17/955—Proximity switches using a capacitive detector
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
  • H03K17/96—Touch switches
  • H03K17/962—Capacitive touch switches
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
  • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
  • H03K2217/96—Touch switches
  • H03K2217/9607—Capacitive touch switches
  • H03K2217/960755—Constructional details of capacitive touch and proximity switches
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
  • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
  • H03K2217/96—Touch switches
  • H03K2217/9607—Capacitive touch switches
  • H03K2217/960785—Capacitive touch switches with illumination
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
  • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
  • H03K2217/96—Touch switches
  • H03K2217/9607—Capacitive touch switches
  • H03K2217/960785—Capacitive touch switches with illumination
  • H03K2217/96079—Capacitive touch switches with illumination using a single or more light guides

Definitions

• Capacitive proximity sensor comprising a one or more translucent regions having the display panel on whose facing away from an observer side, a first circuit board is disposed to be ⁇ field formed least in the area of the translucent regions of the display light translucent and kapazticiansbil ⁇ wearing sensor layers, with light wells, which surround the sensor layers on the side facing away from the observer and from the first circuit board to a extending parallel to the first circuit board extending second circuit board, wherein on the second circuit board within the light wells light sources are arranged and wherein a contact element leads from the first circuit board to the second circuit board.
• Such capacitive proximity sensors serve to generate a change in capacitance when approaching in particular a hand of a person by evaluating the measurement signal by a control and evaluation unit. For easier locating of the sensor areas or serve thereby the illuminable transparent or translucent areas of the display panel.
• Object of the invention is to provide a capacitive proximity sensor, which has a compact, simple and inexpensive producible structure, has good sensitivity when approaching the hand of an observer and allows easy locating the sensor areas.
• this object is achieved in that light guides are applied on the first printed circuit board on the first printed circuit board in the regions of the translucent regions the first printed circuit board of a function carrier made of opaque plastic on the observer side with the same thickness as the light guide, the areas of the light guide ⁇ both sides on the first circuit board ausquaintd and on the side facing away from the observer, the light wells ums ⁇ forming is, with a observer side the Optical fiber and the function carrier overlapping, opaque decorative layer having in the areas of the translucent areas signs and / or symbols forming openings, wherein the second circuit board is fixed to the observer ⁇ th side of the function carrier.
• the illuminated areas in the immediate vicinity or even in the area of the sensor layers make it easy to find the sensor area.
• the function carrier generated by encapsulation of the light guide and the first circuit board fulfills a Mehrfachfunkti ⁇ on by not only the holder of the light guide and the first circuit board takes place by him, but also the light wells are formed.
• the function carrier can also be used for fastening the second printed circuit board and possibly other elements such as turntables.
• the apertures in the decorative layer can be produced in any suitable manner. Particularly simple and suitable breakthroughs can be generated by means of a laser process.
• the light sources are preferably LED's, which are easily be fitted by SMD construction, have a low heat unwinding ⁇ ckelung, high durability and low power consumption.
• optical fibers and the function carrier are overmoulded with a transparent plastic layer applied to the decorative layer on the observer side, sink marks on the optical fibers and the function carrier and in the boundary regions between optical fibers and function carriers as well as differences in height towards the observer side Light guides and function carrier balanced and a uniform level to the observer side out ⁇ hold.
• the decorative layer can be a lacquer layer.
• the first printed circuit board is a flexible printed circuit board, this leads to a small installation space. Furthermore, this makes it possible to deform the flexible first Lei ⁇ terplatte before arranging the light guide and the encapsulation of the function carrier eg by deep drawing in a 3-D contour, so that the observer facing side of the function carrier and thus the display a 3-D contour can receive.
• colored lighting of the light guide these can be monochrome or multicolored translucent. But it is also possible to use colored light sources.
• the first circuit board in the areas of the translucent areas may have corresponding areas of the continuous continuous from ⁇ recesses which are covered by the light guides.
• the second light guides the light ⁇ wells largely effetra ⁇ gene to the second circuit board.
• the first optical fiber and / or the second optical fiber can be applied by gluing or by spraying onto the first printed circuit board.
• the mutually associated first optical waveguides and second optical waveguides can be formed integrally.
• Figure 1 a perspective sectional view of a first
• Figure 2 a perspective sectional view of a second
• Figure 3 a front perspective view of a proximity sensor according to FIGS. 1 and 2 without a second circuit board
• Figure 4 is a perspective view of a first conductor ⁇ plate of the proximity sensor of Figure 1;
• FIG. 5 shows a perspective front view of the proximity sensor according to FIG. 1 without decorative layer and second printed circuit board;
• FIG. 6 shows a perspective rear view of the proximity sensor according to FIG. 5.
• the approach sensors shown have a first printed circuit board 1, which is designed as a flexible printed circuit board, which carries unillustrated printed conductors and capacitive ⁇ forming sensor layers.
• the first circuit board 1 is transparent.
• the sensor layers are likewise transparent and may be so-called ITO layers (indium-tin-oxide layers).
• Both the sensor layers as well as at a distance ferrous ben sensor layers by spraying first light guide 2 and further first light guide 2 'applied to the printed ⁇ te. 1
• Light guide 12 is applied, which continue on the side facing away from the observer of the first circuit board 1, the first Lichtlei ⁇ ter 2.
• the first circuit board 1 was inserted into an injection mold ⁇ and with a box-like function carrier 3 of light encapsulated impermeable plastic, wherein the region of the first optical fiber 2 and the other first optical fibers 2 'remain recessed on both sides of the first circuit board 1 and the observer side, the first circuit board 1 overlapping region of the function carrier 3, the same thickness as the ers ⁇ th light guide 2 and the other first light guide 2 'has.
• the function carrier 3 forms light shafts 4.
• a light shaft 4 is assigned to each pair of first optical waveguides and further first optical waveguides 2 and further first optical waveguides 2 'assigned to a sensor layer.
• the light shafts 4 are once again subdivided into first light shafts 4 'and second light shafts 4' ', the first light shafts 4' leading to the first light guides 2 arranged on the sensor layers and the second light shafts 4 '' leading to the further first light guides 2 '.
• a contact element 5 forming process of the first printed circuit board 1 is computationally ⁇ twinklig toward the side opposite to the observer side and bent up at its free end in the injected one function carrier 3 from the plane of the first printed circuit board.
• the light wells 4 are on its side facing away from the observer from a common second circuit board 6 strigosine, which is attached to the function carrier 3.
• the driven LED's are the first light conductor 2, the openings 9 and the other first

Landscapes

• Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=44072765

Family Applications (1)

Country Status (6)

Families Citing this family (13)

Citations (5)

Family Cites Families (9)

• 2010
  • 2010-04-06 DE DE102010013947.5A patent/DE102010013947B4/de not_active Expired - Fee Related
• 2011
  • 2011-03-29 WO PCT/EP2011/054822 patent/WO2011124507A1/de active Application Filing
  • 2011-03-29 CN CN201180017976.4A patent/CN102823136B/zh not_active Expired - Fee Related
  • 2011-03-29 EP EP11711865.3A patent/EP2556591B1/de not_active Not-in-force
  • 2011-03-29 KR KR1020127025950A patent/KR101752665B1/ko active IP Right Grant
  • 2011-03-29 US US13/640,269 patent/US8890839B2/en not_active Expired - Fee Related

Patent Citations (5)

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